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VINAYAKA MISSIONS UNIVERSITYV.M.K.V. ENGINEERING COLLEGE, SALEM-636308

DEPARTMENT OF ELECTRONICS & TELECOMMUNICATION ENGINEERINGSEMESTER-VI

SUBJECT NAME: TELECOMMUNICATION SWITCHING & NETWORKSQUESTION BANK

UNIT 1: MULTIPLEXINGPART A

1. What is Differential Encoding?2. Define Payload Framing?3. List out the various transmission system in telecommunication network?4. Define FDM modulation?5. Define line coding?6. Define differential encoding?7. What is digital biphase?8. Draw the frame format of STS-1 level?9. What is Virtual Tributaries?10.What short notes on SONET networks?11.Write down concept of freq justification?12.Draw the block dig of SONET system?13.Compare synchronous and statistical time division multiplexing.14.What is meant by data scrambling?15.Define trunk.16.What is called as clock recovery in TDM?17.What are the two types of stuffing? And explain.18.What is called as bipolar violations?19.What is differential encoding?20.What is called as UPSR?21.Define phase distortion.22.What is called as loading coils?

23.Give the advantages of four fiber BLSR.24.What is mean by ADM? And its use?25.What are all the levels in SONET system hierarchy?

PART B

1. Explain the concept of FDM multiplexing?2. Write about SONET frame format?3. Describe the ds3 pay load mapping and e4 payload mapping?4. Explain the concept SONET rings?5. Explain the working operation and administration of SONET systems?6. Explain the following terms (i) TDM loops and rings (ii) Bit interleaving versus

word interleaving ( iii ) Binary N zero substitution7. Explain the functions of SONET multiplexing and networks?8. Discuss about the concept of digital transmission and multiplexing?9. Draw and explain time division multiplex loops and rings.10.Give a brief note on operation, administrative and maintenance features of

SONET.

UNIT 2: DIGITAL SWITCHINGPART A

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1. What is the need of multidimensional switching?2. What is switching system?3. Define space switching?4. Define Multiplexing?5. Define path finding?6. What is non-blocking switching?7. Draw the lee graph of 3 stage switching network?8. Draw the circuit diagram of folded four wire switches?9. What is BORSCHT?10.What are the functions of TSI circuit?11.Write short notes on switch matrix control?12.Draw the circuit diagram of 4-wire digital switch?13.Why higher sampling rates are preferred in analog time division switching?14.How the control memory in TS switches implemented?15.Define time division switching.16.Define Electronic Switching.17.Define Digital Switching.18.List out the advantage of folded four-wire switches.19.Write the formula for implementation complexity of a TST?20.What are the switching categories of voice circuits?21.What is local switching and call distribution?22.What are the applications of space division switching?23.What is the formula for calculating the no. of cross points required by three

stage switch?24.Write the types of time division switching?25.Write the types of multiple stage switching?

PART B

1. Explain the following 1. STS switching 2) TST switching2. Explain the principle of time division switching.

3. Discuss the concept of switch matrix control.4. Explain in detail about No.4 ESS toll switch.5. Discuss about the concept of two dimensional switching networks?6. Explain in working operation of digital memory switch?7. Explain the concept of digital switching in an analog environment?8. Discuss the Lees method of blocking probability analysis.9. Explain about folded four wire switch matrix and path finding?10.Explain the elements of ss7 signaling.

UNIT- 3: NETWORK SYNCHRONIZATION CONTROL AND MANAGEMENT

PART A1. List out the timing inaccuracies?2. Define clock instability?3. What is Doppler shift?4. What is an elastic store?5. What is the application of elastic store?6. Define slip rate?7. What is waiting time jitter?8. List out the various approaches used in synchronizing a digital network?

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9. Define time interval error?10.Define timing jitter.11.Define an elastic store and also give its application.12.What is meant by Pulse Stuffing?13.What is meant by master-slave synchronization?14.What is PLL?15.What is the approach used in synchronizing digital network?16.What is Mutual synchronization?17.What is Plesiochronous?18.What is flow control and routing control?19.Explain main purpose of state transition diagram?20.What is the purpose of Pulse Stuffing?21.What is Mutual synchronization?22.What is time variance?23.What is the purpose of state transition diagram?24.What is TIE?25.What are the sources of clock instability?

PART B:1. Describe in details about 1. Phase locked loop 2.Jitter measurements

3.Systematic jitter.2. Explain the concept of network control and network management?3. With suitable block diagram explain the function of jitter removing

regeneration repeater4. Discuss in details about timing in accuracies?5. Explain the working operation of M12 multiplexer6. Explain the concept of network synchronization?7. Discuss about the concept of network timing performance measurement.8. Discuss the main sources of clock instability in a digital network9. Discuss the principle of network control and management.10.Explain the major sources that cause clock instability in digital networks.

UNIT 4: DIGITAL SUBSCRIBER ACCESSPART A

1. Differentiate ADSL and VDSL.2. Write the concept of PCM modem operation.3. What is ADSL?4. Define ISDN?5. List out 2 principles of ISDN?6. Name some services provided by ISDN.7. List out the various features of ISDN B channel?8. List out the various features of ISDN D channel?

9. Write short notes on basic rate and primary rate access to ISDN.10.What is S bus?11.Write notes on fiber in the loop?12.What is LMDS local microwave distribution service?13.What is PCM modem?14.State any two basic features of ISDN B channels.15.Write the features and applications of VDSL.16.What are the functions of ISDN U interface?17.Compare FTTH and FTTC.

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18.Explain the term DSL19.Name the Current Versions of DSL Technology.20.What are the advantages of PCM modems?21.What is DSS?22.What are advantages of ISDN?23.Write User-Network Interface Configuration for ISDN24.What are two types of interfaces used in ISDN?25.Compare IDN AND ISDN.

PART B

1. Explain the following 1.ISDN D channel protocol ii. Hybrid fiber coax systems.2. Write in detail about ISDN basic rate access architecture.3. Explain the function of digital loop carrier systems..4. Explain in detail about ADSL with suitable block diagram.5. Explain the following i. Local microwave distribution service ii. Fiber in the

loop6. Give a brief account on the different services supported by ISDN.7. Write a brief note on voice band modems8. Explain the techniques used in high data rate digital subscriber loops.9. Discuss the principles of digital loop carrier systems.10.Write short notes on; i. ISDN U interface ii. PCM modems iii. ISDN B and D

channels.

UNIT 5: TRAFFIC ANALAYSISPART A

1. Define an Erlang.

2. Define traffic intensity.3. Define busy hour.4. What is loss system?5. What is TASI?6. What is delay system?7. What is blocking probability?8. Draw the queuing system notation of a delay system.9. What are the two categories used to analyze the traffic?10.Distinguish call congestion and time congestion.11.What is packet switched node?12.Define call congestion.13.Types of arrival distribution.

14.What are all the techniques used in network blocking probabilities15.List out the applications of queuing theory.16.What are all the parameters used to characterize traffic? And write down the

formula.17.What are the Assumptions of lost call returning?18.Define Poisson arrival distribution19.Define traffic carried.20.Define traffic flow.21.How traffic will arises in traffic analysis?

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22.What are the two categories of traffic analysis?23.What is the probability function for the constant holding time?24.Define traffic in communication network.25.Write short notes on finite queues.

PART B

1. Discuss about loss system.2. Explain in details about Delay systems.3. Explain the following traffic characterizations i. Arrival distribution ii. Holding

time distribution.4. Short notes on following i. End to end blocking probalities ii. Lost call cleared

systems.5. Discuss about the last call cleared system & lost calls returning system in

switching system.6. Describe the effect of blocking probability on the network traffic.7. Explain the LCC systems with infinite sources and derive the Erlang B

formula. What happens when the sources become finite?8. Explain finite queues and tandem queues?9. Discuss the applications of delay systems in modeling and analyzing

communication networks.10.Explain the arrival and service time distributions used in telecommunication

traffic analysis.

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